Boiler-feeding apparatus.



N. E.- NASH. BOILER FEEDING APPARATUS.

APPLICATION FILED JULY 20, 1907.

Patented Jan.5, 1909.

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INVENTOH WITNESSES.

ATTOR/VEKS'.

NATHAN E. NASH, OF TORONTO, ONTARIO, CANADA.

BOILER-FEEDING APPARATUS.

Specification of Letters Patent.

Patented Jan. 5, 1909.

Application filed July 20, 1907. Serial No. 384,733.

To all whom it may concern:

Be it known that I, NATHAN E. NASH, of the city of Toronto, in the province of Ontario, Dominion of Canada, have invented certain Improvements in Boiler- Feeding Apparatus, of which the following is aspecification.

This invention in common with others of its class, is to automatically maintain a predetermined height of water in a steam boiler; and it relates particularly to a boiler feeder in which a motor adapted to control the operation of the valve which admits feed water to the boiler is operated by compressed air through the medium of a float inclosed within a vessel in communication with the steam and water spaces of the boiler, and therefore comtains a column of water the height of which corresponds with that of the water in the boiler.

In the further description of the said invention which follows, reference is made to the 'accom anying drawing forming a part hereof, an in which,-

Figure 1 is a partly sectional side view of the improved apparatus. Fig. 2 is an enlarged side section of a part of the apparatus shown exteriorly in Fig. 1. Fig. 3 is a partly sectional to viewof Fig. 2. Fig. 4 is an end view 0' a certain valve stem constituting an element of the apparatus.

Referring now to the drawin 1 is a vessel containing a water column. ts upper end is adapted for connection to the steam, and its lower end to the water space of the boiler, through the medium of the apertures a. and b respectively.

The lower end of the shell 1 has a globular extension 2 in which sediment is deposited by the water from the boiler, and from which it is at times ejected through a pipe not shown, which is screwed into the nozzle 0.

The gage cocks, not shown, are screwed into the nozzles d, e and f, and the dotted line 9 extending centrally throu h the nozzle e indicates the hei ht at whic the water is to be maintained.

The feed water valve which is to be opened and closed by means of the apparatus forming the subject of this invention, is one of ordinary description, and the motor which is also well known, consists of a diaphragm upon which compressed air is allowed to act to close the valve, the reverse movement of the valve, or that wherein it is opened,

being effected by a spring; and in connection with such mechanism, is employed a tank in which air under pressure is stored, but as this tank like the valve mechanism above briefly described is an old device, it is not illustrated in the drawing. a

3 is avalve shell screwed into the wall of the vessel 1 near its upper end, having the inlet and outlet air passages denoted by h and i communicating respectively with the compressed air tank and the exterior of the diaphragm not shown, which serves. to close the feed water valve.

The passages h and i are connected by the channels 1' and k, and at the junction of these channels is a double faced valve 5 preferably formed as a part of the stem 7 which extends through a plug 9 which is screwed into the wall of the shell 3 as best shown in Fig. 2. 1 When the valve 5 is in the position shown in Fig. 2, the channel is closed and there is no passage of compressed air from the air tank to the space above the diaphragm which constitutes the motor arran ed to close the feed water valve, and the sai space being in communication with the outer air by means of the channel is and the grooves m in the valve stem 7, the valve 5 being moved from its seat at the inner end of the plug 9, the feed water valve is o sued by the spring. Should, however, the va ve 5 be drawn outwardly so as to open the channel j and close the escape to the outer air, compressed air will pass through the channels j and is to the diap iragm and the feed water valve will be closed.

To effect the operation of the double faced valve 5 to produce the results just described, through the change in height of the water column in the vessel 1, the outer end of the stem 7 is jointed to an arm 10 which is tight on a shaft 12 which extends throu h one slde of the bored portion n of the shdll 3 and is seated in a conical depression in the opposite side of the shell as is well shown in Fig. 3.

To prevent leakage of steam around the shaft 12 withoutthe employment of a packbox, the said shaft is provided with a sp erical collar 0 against which the recessed end of a screw plug 13 is pressed, as shown in Fig. 3.

15 is a lever rigidly attached to the shaft 12 situated in the cavity 1) in the part n of the shell 3 which is screwed into the wall of the vessel 1, as shown in Fig. 1. This lever is loosely connected to a rod q having a float 17 at its lower end, which is partly immersed in the water.

From the foregoing description it will be understood that in a slight increase in height of the water column in the vessel 1, the float 17 in rising, causes the opening of the channel j and admits compressed air to the space above the motor diaphragm, when the spring opposing the movement of the diaphragm is overcome, and the feed water valve closed. Should the height of the water in the vessel 1 be reduced, the float will fall, and by a reversal in position of the double faced valve 5, the channel will be closed, and air which has been confined above the motor diaphragm allowed to escape through the grooves in the valve stem 12 to the outer air, when the motor spring will open the feed water valve which admits more water to the boiler.

I claim as my invention In a boiler feeding apparatus, a vessel having a steam and a water supply whereby water is maintained therein at a height corresponding to that of the water in a boiler connected therewith, combined with a shell which is screwed into the wall of the vessel and whose interior is in communication with the interior of the vessel, the wall of the said shell having therein an inlet passage for air under pressure and an outlet air channel leading from the said passage; a shaft with a pointed end which passes through one side of the shell and Whose point rests in a conical depression in the opposite side of the shell, the said shaft having a spherical collar; a bored plug having a hemispherical depression on its inner end, which is placed over the projecting portion of the shaft to hold the same steam-tight'inplace; an arm fastened to the said shaft; a double-faced valve hin ed to the saidarm, to admit of the passage 0% air through the device, or prevent such passage and admit of the escape ofjair which has passed through the device; a lever fastened to the shaft at a point within the shell, and which extends to the interior of the vessel; and a float situated in the vessel and suspended from the Said lever, substantially as specified.

NATHAN E. NASH.

Witnesses:

THOMAS G. H LL, WM. T. HOWARD. 

